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A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up-and-down motion.
The velocity points down.
Reinforcement
In behavioral psychology, it refers to any stimulus which strengthens or increases the probability of a specific response.
Unpleasant Stimulus
A stimulus that is generally undesirable or disagreeable to an individual, often leading to avoidance behavior.
Punishment
Any event or object that, when following a response, makes that response less likely to happen again.
Positive Reinforcement
The reinforcement of a response by the addition or experiencing of a pleasurable stimulus.
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